Process of forming bosses on metal blades.



G. F. HUTCHINS.

PRO CESS or FORMING BOSSES 0N METAL BLADES.

I APPUCATION FILED MAY 14. 1915. 1,220,748. Patented Mar. 27, 1917.

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GEORGE E. HUTCHINS, OF WORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

PROCESS OF FORMING BOSSES ON METAL BLADES.

Application filed May 14, 1915.

To all whom it may concern:

Be it known that I, GEORGE F. HUTCHINS, a citizen of the United States, residing at WVorcester, in the county of WVorcester and State of Massachusetts, have invented a new and useful Process of Forming Bosses on Metal Blades, of which the following is a specification.

This invention relates to a process of forming bosses on metal blades such for instance as dobby lifter hooks in which the side bosses are separately formed and are thereafter welded or otherwise secured to the blade.

It has been customary to provide a reduced cylindrical portion on each side boss, adapted to extend into and be secured in a cylindrical recess near one end of the blade, but it has been found that the repeated and excessive strains sustained by the side bosses eventually loosen the bosses and disengage them from the blade.

It is the principal object of my present invention to improve the process of making such blades by first providing a non-circular recess in the blade adapted to receive correspondingly-shaped projections upon the bosses, as I have found that the loosening of the bosses may be practically eliminated by preventing any angular movement between the boss and the blade.

A further improvement consists in forming said projections of slightly greater length than one-half the thickness of the blade, thereby providing an excess of metal with which to fill every crevice and open space during the welding operation.

The several steps of my improved process and the order of their execution will be hereinafter described and more particularly pointed out in the appended claims.

A preferred form of my invention is shown in the drawings, in which Figure 1 is an enlarged detail view of one end of a blade before the bosses are attached thereto;

Figs. 2 and 3 are a side elevation and bottom view respectively of one of the bosses;

Fig. 4 is a sectional view of one end of one of the blades taken along the line 44 in Fig. 1 and having the two opposite bosses positioned in the recesses thereof; and

Fig. 5 is a sectional view similar to Fig. 4 but showing the homogeneous condition of Specification of Letters Patent.

Patented Mar. 27, 1917.

Serial No. 28,208.

the blade and bosses after the parts have been electrically welded.

In Fig. 1 I have shown one end of a metal blade 12 to which a double boss or pair of side bosses 15 is to be secured.

To prevent the possibility of angular movement of the bosses 15 relative to the lifter blade 12, I provide a recess 16 of irregular outline near one end of the blade. The recess shown in the drawings has the form of a Greek cross but I do not wish to be limited to this particular outline, as recesses of other and difi'erent outlines may be utilized in carrying out this feature of my invention. Each boss 15 comprises a cylindrical portion having a projection 17 upon one face thereof, said projection being shaped to fit closely within a portion of the recess 16.

The projection shown in the drawings is substantially rectangular in shape and is adapted to fit within two of the arms of the cross-shaped recess 16, the projection of the other boss being fitted within the arms positioned at right angles to those first mentioned.

I have found it desirable to form each projection 17 of a height slightly greater than one half of the thickness of the blade 12, as I thus provide surplus material which is available to completely fill the recess 16 and to firmly unite the three parts into a homogeneous structure as an electric welding current is passed therethrough.

Having thus described my invention it will be evident that changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope thereof as set forth in the claims, and I do not wish to be otherwise limited to the details herein disclosed, but what I claim is 1. The process of forming a double boss on a metal blade which consists in forming a non-circular opening in said blade, forming a pair of bosses each with a projection thereon, the combined height of said projections being slightly greater than the thickness of said blade, fitting said bosses to said blade with the projections extending into said recess and held from angular movement therein, and thereafter welding said bosses to said blade under pressure.

2. The process of forming a double boss Copies of this patent may be obtained for five cents each, by addressing the on a metal blade Which consists in forming a four-armed opening in said blade, forming a pair of bosses each with a substantially rectangular projection of a height slightly exceeding one half the thickness of the blade, assembling said parts with each projection fitting alternate arms of said recess, and Welding said bosses to said blade under pressure.

In testimony whereof I have hereunto set my hand.

GEORGE F. HUTCHINS.

Commissioner of Eaten-ts Washington, 10. G. 

